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| 碎石土渗透特性试验研究 |
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张国栋1,2,3, 廖爱明1,2,3, 李泯蒂4, 邱重阳1,2,3, 徐志华1,2,3
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1.三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心，湖北宜昌;2.三峡大学湖北长江三峡滑坡国家野外科学观测研究站,湖北宜昌;3.三峡大学湖北省地质灾害防治工程技术研究中心,湖北宜昌;4.长江三峡通航管理局,湖北宜昌
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| 摘要: |
| 碎石土渗透系数是渗流分析及边（滑）坡稳定性评价等问题的关键参数。由于碎石土具有非均质性、非连续性以及影响因素多等独特性质，研究碎石土渗透特性的困难较大。利用大型渗透仪，试验研究了碎石含量、孔隙比和颗粒级配对碎石土渗透系数的影响规律，分析了渗流前后颗粒级配变化及其对渗流特性的影响，以及碎石含量、孔隙比大小对渗流前后颗粒级配变化的影响。结果表明：碎石含量与渗透系数之间关系符合指数关系；孔隙比与渗透系数之间的关系符合多项式拟合关系；特征粒径、不均匀系数和曲率系数与渗透系数之间的关系符合线性拟合关系，颗粒级配对渗透特性的影响主要是不均匀系数和特征粒径，曲率系数影响较小；渗流前后颗粒级配的变化与水力梯度有关。 |
| 关键词: 碎石土 渗透系数 颗粒级配 水力梯度 |
| DOI： |
| 分类号:TU411.4；P642.2 |
| 基金项目:湖北省自然科学基金创新群体项目（2012FFA040）;湖北省科技支撑计划项目(2013BEC005,2015BCE038) |
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| Model test studies on permeability of gravel soil |
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ZHANG Guo-dong1,2,3, LIAO Ai-min1,2,3, LI Min-di4, QIU Chong-yang1,2,3, XU Zhi-hua1,2,3
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1.Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, China Three Gorges University, Yichang;2.National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang;3.Hubei Engineering Research Center of Geological Hazards Prevention, China Three Gorges University, Yichang;4.Three Gorges Navigation Authority, Yichang
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| Abstract: |
| The permeability of gravel soil is a key index for analysis of seepage through gravel soil and stability of slope. The gravel soil has the unique properties of homogeneity, discontinuity and so on, and it is very difficult to study. The studies of influences of gravel content, void ratio and grain composition on the permeability coefficients of the gravel soil have been carried out using a large-size permeameter. The analysis of effects of the gravel content and void ratios on the grain composition was made in the tests of seepage. The test results show that the relationship between the gravel content and the permeability coefficients fits in with an exponential function; the relationship between the void ratios and the permeability coefficients is comformable a multinomial function; and the relationship between the grain composition and the permeability coefficients is a linear one. The effects of the grain composition on the seepage are mainly the non-uniformity coefficients and characteristic particle size, and the curvature coefficients are affected slightly. Before and after seepage through the gravel soil, the changes of the grain composition are related to the hydraulic gradients. The research results can provide an available reference for getting values of the permeability coefficients and for establishing an empirical formula. |
| Key words: gravel soil permeability coefficients grain composition hydraulic gradient |
